just from looking without any calculations, mileage box doesn't feel worth it

edit: petunio is right, in terms of value, fusion flames are worth more than half the reds

Again, some items may be important to me and not important to you and vice versa. The reason why I put flames in orange category is because you don't need flames for enhancing equipments, but anyway, it's just my opinion. If flames for you are red then that's great.